how to fix P0171 lean condition in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical short circuits.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers
• Locate all vacuum hoses connected to the intake manifold.
• Visually inspect for cracks or disconnections.
• Use a vacuum gauge to check for any irregular readings indicating a leak.
• Replace any damaged hoses or reattach disconnected hoses securely.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner, torque wrench
• Disconnect the MAF sensor electrical connector and remove the sensor from the intake manifold.
• Spray MAF cleaner onto the sensor’s wire elements to remove dirt and debris (do not touch the wires).
• Reinstall the MAF sensor and reconnect the electrical connector, ensuring it’s secure.

4. Fuel Pressure Test

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Attach the fuel pressure gauge and turn the ignition to the ON position without starting the engine.
• Check the fuel pressure reading against manufacturer specifications (typically around 43-50 psi).
• If the pressure is low, inspect the fuel filter and fuel pump for issues and replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit, torque wrench
• Remove the fuel rail to access the injectors.
• Inspect each injector for clogs or leaks.
• If necessary, clean the injectors using a fuel injector cleaning kit.
• Reinstall the fuel rail and torque it to manufacturer specifications.